Develop Reference

Modify a PNG image in the drawable folder

I have a PNG file in my drawable folder.
I need to modify it merging on it a smaller image.
I use this code for create a new Bitmap
Bitmap bigImage = BitmapFactory.decodeResource(getResources(), R.drawable.i10);
Bitmap smallImage = BitmapFactory.decodeResource(getResources(), R.drawable.i11);
Bitmap result = Bitmap.createBitmap(bigImage.getWidth(), bigImage.getHeight(), bigImage.getConfig());
Canvas canvas = new Canvas(result);
canvas.drawBitmap(bigImage, 0f, 0f, null);
canvas.drawBitmap(smallImage, 10, 10, null);
That I miss is the final part. Assign the new bitmap (bigImage) to "R.drawable.i10"

Resources are static, you cannot change those files once they are shipped in the app (Apk)...
However you can create/manipulate the existing ones & save it as a new file on Storage but that's a different thing & not related with the question!

How to convert imageurl to drawable?

First of all i searched a lot and didn't find solution for my case, i need to convert the imageUrl to drawable, what i tried as far :
File imageFile = DiskCacheUtils.findInCache(c.profilePhoto, com.nostra13.universalimageloader.core.ImageLoader.getInstance().getDiscCache());
String file_target = "file://" + imageFile.getPath();
BitmapDrawable bitDraw = (BitmapDrawable) BitmapDrawable.createFromPath(file_target);
if (profilePhotos.size() == 4) break;
BitmapDrawable drawable = bitDraw; //getResources().getDrawable(c.profilePhoto);
drawable.setBounds(0, 0, width, height);
profilePhotos.add(drawable);
Also i tried to load the image into bitmap via Glide, but didn't work.
How i can achieve that ?
Thanks in advance.

first convert URL to Bitmap and pass bitmap into these function
Drawable d= new BitmapDrawable(context.getResources(), bitmap);
return d;

Converting a Drawable to a Bitmap to change the color of a Marker in Google Maps Android API v2

I'm converting an old application from v1 to v2, and I'm having a problem with the color of my Marker icons. I have a basic, white icon, and It needs to be colorized.
In v1, I did it this way :
Drawable d = DrawableUtils.resizeImageToDrawable(
MapViewFragment.mapviewActivity,
Configuration.Display.getDrawableFix(i),
Configuration.MapView.getWaypointIconWidth(),
Configuration.MapView.getWaypointIconHeight());
d.setColorFilter(color, Mode.MULTIPLY);
overlay = new MyFplnFixListItimizedOverlay(d);
Since v2 Markers do not accept Drawables for their icons, I thought about converting the Drawable to a Bitmap, like this :
Drawable d = DrawableUtils.resizeImageToDrawable(
MapViewFragment.mapviewActivity,
Configuration.Display.getDrawableFix(i),
Configuration.MapView.getWaypointIconWidth(),
Configuration.MapView.getWaypointIconHeight());
d.setColorFilter(color, Mode.MULTIPLY);
Bitmap icon = ((BitmapDrawable) d).getBitmap();
Marker marker = MapViewFragment.map.addMarker(new MarkerOptions()
.position(point)
.title(Integer.toString(fplnType))
.visible(true)
.icon(BitmapDescriptorFactory.fromBitmap(icon)));
But for some reason, it's not working. The icons stay white. Anyone knows why ?
Thanks in advance.

OK, here's how I did it at the end of the day :
Drawable d = DrawableUtils.resizeImageToDrawable(
MapViewFragment.mapViewActivity,
Configuration.Display.getDrawableFix(i),
Configuration.MapView.getWaypointIconWidth(),
Configuration.MapView.getWaypointIconHeight());
d.setColorFilter(color, Mode.MULTIPLY);
Bitmap b = ((BitmapDrawable) d).getBitmap();
Canvas myCanvas = new Canvas(b);
int myColor = b.getPixel(0,0);
ColorFilter filter = new LightingColorFilter(myColor, color);
Paint pnt = new Paint();
pnt.setColorFilter(filter);
myCanvas.drawBitmap(b,0,0,pnt);
Marker marker = MapViewFragment.map.addMarker(new MarkerOptions()
.position(point)
.title(Integer.toString(fplnType))
.visible(true)
.icon(BitmapDescriptorFactory.fromBitmap(b)));

If your drawable is not defined in a XML, you can do it with this method:
protected Bitmap fromDrawable(final Drawable drawable, final int height, final int width) {
final int widthDip = (int) TypedValue.applyDimension(1, width, getResources()
.getDisplayMetrics());
final int heightDip = (int) TypedValue.applyDimension(1, width, getResources().getDisplayMetrics());
final Bitmap bitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
final Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
drawable.draw(canvas);
return bitmap;
}
Note that if you need to do it from OUTSIDE an Activity, you'll also need to pass a Context (in order to call context.getResources().getDisplayMetrics()). You also pass the DisplayMetrics object instead.

I'm not sure what this DrawableUtils is doing, but you're casting it to a BitmapDrawable. Is it really a BitmapDrawable?
here's some code to extract a Bitmap out of any type of drawable:
Drawable d = // make sure it's not null
d.setBounds(0, 0, width, height);
Bitmap b = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(b);
d.draw(c);
the idea is that you create a canvas on a mutable bitmap and draw that drawable on the canvas
edit:
I've just seen the #Analizer answer and yeah, my answer is good if you don't have the Drawable as a resource. But if you do, user his answer instead.

Android water mark

I have some question about water mark within android code!
Following code showed my idea about WaterMark!
However,It does not work normally.
e.g. only the image end with .png can be watered mark
Is there a scheme about water mark(.jpeg, .jpg, .wbmp, .bmp, .png or others)
protected static Bitmap getDrmPicture(Context context,String path){
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
Bitmap originMap = BitmapFactory.decodeFile (path,options);
Bitmap waterMark = BitmapFactory.decodeResource(context.getResources(), R.drawable.close);
InputStream input;
byte[] b;
Bitmap waterMark = null;
try {
input = context.getResources().openRawResource(R.drawable.lock);
b = new byte[input.available()];
input.read(b);
waterMark = DecodeUtils.requestDecode(jc, b, null);
}catch(IOException e){
}
int w = originMap.getWidth();
int h = originMap.getHeight();
int ww = waterMark.getWidth();
int wh = waterMark.getHeight();
Bitmap newb = Bitmap.createBitmap(w, h,Bitmap.Config.ARGB_8888;);
Canvas cv = new Canvas(newb);
cv.drawBitmap(originMap, 0, 0, null);
cv.drawBitmap(waterMark, w - ww, h - wh, null);
cv.save(Canvas.ALL_SAVE_FLAG);
cv.restore();
return newb;
}
Thanks !

This is the code I use to apply watermark to a jpeg, it should work for you too,
public Bitmap applyWatermarkColorFilter(Drawable drawable) {
Bitmap image = ((BitmapDrawable)drawable).getBitmap();
Bitmap result = Bitmap.createBitmap(image.getWidth(), image.getHeight(), Config.ARGB_8888);
Canvas canvas = new Canvas(result);
canvas.drawBitmap(image, 0, 0, null);
Bitmap watermark = BitmapFactory.decodeResource(getResources(), R.drawable.watermark);
canvas.drawBitmap(watermark, image.getWidth()/2 - watermark.getWidth()/2,
image.getHeight()/2 - watermark.getHeight()/2,
null);
return result;
}
Basically after this u have to use Bitmap.compress(<arguments>) to get a jpg out of it.
Din't try for the other formats. May be it might be possible if you can extract the Bitmap out of them like how we do for jpg and png.

https://stackoverflow.com/questions/6756975/draw-multi-line-text-to-canvas
Measure height of multiline text
To center text vertically we need to know text height. Instantiate StaticLayout with text width according to your needs, for us it is simple the width of Bitmap/Canvas minus 16dp padding. The getHeight() then returns height of text.
Positioning text on Canvas
There are four simple steps to position text on Canvas:
Save the current matrix and clip with Canvas.save().
Apply translation to Canvas matrix with Canvas.translate(x,y).
Draw StaticLayout on Canvas with StaticLayout.draw(canvas).
Revert matrix translation with Canvas.restore() method.

error with setPixels

i am trying to edit images. but i am getting errors with setPixels.
picw = pic.getWidth();
pich = pic.getHeight();
picsize = picw*pich;
int[] pix = new int [picsize];
pic.getPixels(pix, 0, picw, 0, 0, picw, pich);
pic.setPixels(pix,0,pic.getWidth(),0,0,pic.getWidth(),pic.getHeight());
but i am getting illegal state exception with setPixels
Caused by: java.lang.IllegalStateException
at android.graphics.Bitmap.setPixels(Bitmap.java:878)
at com.sandyapps.testapp.testapp.onCreate(testapp.java:66)

I think your Bitmap is not mutable (see setPixel()'s documentation).
If so, create a mutable copy of this Bitmap (using Bitmap.copy(Bitmap.Config config, boolean isMutable) as an example) and work on this one.

It's simple, just use the following command to change it to a mutable Bitmap:
myBitmap = myBitmap.copy( Bitmap.Config.ARGB_8888 , true);
Now the Bitmap myBitmap is replaced by the same Bitmap but this time is mutable
You can also choose another way of storing Pixels (ARGB_8888 etc..):
https://developer.android.com/reference/android/graphics/Bitmap.Config.html

Most probably your pic is immutable. By default, any bitmap created from drawable would be immutable.
If you need to modify an existing bitmap, you should do following:
// Create a bitmap of the same size
Bitmap newBmp = Bitmap.createBitmap(pic.getWidth(), pic.getHeight(), Config.ARGB);
// Create a canvas for new bitmap
Canvas c = new Canvas(newBmp);
// Draw your old bitmap on it.
c.drawBitmap(pic, 0, 0, new Paint());

I had the same problem. Use to fix it:
BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inMutable = true;
Bitmap bitmap = BitmapFactory.decodeResource( getResources(), R.drawable.my_bitmap, opt );

I was facing this problem and finally fixed after long time.
public static void filterApply(Filter filter){
Bitmap bitmcopy = PhotoModel.getInstance().getPhotoCopyBitmap();
//custom scalling is important to apply filter otherwise it will not apply on image
Bitmap scaledBitmap = Bitmap.createScaledBitmap(bitmcopy, bitmcopy.getWidth()-1, bitmcopy.getHeight()-1, false);
filter.processFilter(scaledBitmap);
filterImage.setImageBitmap(scaledBitmap);
}